Gliwiczia calcar
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Category
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Length Range9.7-21.2 µm
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Width Range7.1-10.4 µm
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Striae in 10 µm26-32
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SynonymsAchnanthes calcar Cleve 1891
Planothidium calcar Edlund in Edlund, Soninkhishig, Williams and Stoermer 2001
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ContributorMarina Potapova - Nov 2011
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ReviewerSarah Spaulding - Nov 2012
Identification
Description
Valves are elliptic, although they may be slightly constricted in the center. The axial area is narrow and linear on the raphe valve; the axial area is narrow and rhomboid on the rapheless valve. The central area on both valves is asymmetric, expanded to valve margins and contains a cavum. The raphe is straight with sigmoid terminal fissures. The striae are fine, uniseriate and radiate throughout both valves.
Original Description
A. Calcar Cl. - Upper valve broadly elliptic, 0,012 m. m. in length and 0,009 m. m. in breadth, with about 24 striae in 0,01 m. m. It carries on the one side a horseshoe-like thickening, which is prolonged on the other half of the valve into a spur-like projection. The lower valve is not known with certainty, but in the same gathering, in which this species has been found, occurs a valve of similar outline and size, the striæ of which reach the raphe and are 25 in 0,01 m. m. That valve, which has a great resemblance to Diadesmis lucidula Grun. (V. H. XIV, 40) may possibly be the lower valve of A. Calcar. Pl. III, fig. 8, (9 ?). Ab. 45, 47.
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BasionymAchnanthes calcar
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AuthorCleve 1891
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Length Range12 µm
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Width9 µm
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Striae in 10µm24
Original Images
Citations & Links
Citations
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Publication Link: http://dx.doi.org/10.11646/phytotaxa.109.1.1
Links
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Index Nominum Algarum
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North American Diatom Ecological DatabaseNADED ID: 155033
Updates
Apr 06, 2016 - Transfer from Planothidium
The taxon, Planothidium calcar Edlund in Edlund, Soninkhishig, Williams and Stoermer 2001 appeared on this page. (Note that the citation missed attribution to Cleve). As of this date, the name and authorshop is shown as Gliwiczia calcar (Cleve) Kulikovskiy, Lange-Bertalot and Witkowski. - S. Spaulding
Cite This Page
Potapova, M. (2011). Gliwiczia calcar. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/47131/gliwiczia_calcar
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Gliwiczia calcar from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:
ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.
Gliwiczia calcar
- Valves elliptic
- Central area asymmetric
- Cavum present on both valves
- Central area reaches valve margins
Valves are elliptic. The axial area is narrow and linear on the raphe valve; the axial area is narrow and rhomboid on the rapheless valve. The central area on both valves is asymmetric, expanded to the valve margins and contains a cavum. The striae are fine and radiate throughout both valves.